Том: 1979-September , Год издания: 1979

The Siberian Platform is divided into two petroleum-bearing provinces, the Lena-Tunguska and the smaller Khatanga-Vilyui province. The most prospective portion of the Lena-Tunguska province includes buried anteclises of Nepa-Botuoba and Baikit, and the Kureika syneclise containing buried arches. Riphean basal Cambrian and Lower Cambrian petroleum-bearing complexes are known in the sedimentary section. In the Kureika syneclise prospects are also related to Cambrian-Silurian deposits. Permeable strata of the basal and Ordovician complexes are sandstones, the rest are carbonates. Sealing is provided by clays and evaporites. A series of oil/gas and gas condensate fields have been found with low-density, alkane and low-paraffin oils. The search for oil accumulations is complicated by widely developed traps, intensive recent tectonic movements, the ancient age of the stratigraphic section, and the presence of permafrost. The Khatanga-Vilyui province is confined to the platform marginal depressions. Prospective complexes are Permian, Triassic, Jurassic and, in the Yenisei-Khatanga depression, also Cretaceous in age. Reservoir rocks are sandstones, and seals are clays. Gas and gas condensate fields have been discovered in the Tanam arch and the Khapchagai megaswell of this province.